I just picked up a PUK 3+ Pro. I don’t know from the earlier
versions, but the pro+ has more power than the standard 3, which has
more power than the older Mk 2. For some of the heavy work I’m doing
on sterling, the Pro+ has just barely enough power. I’m definitely
still working the kinks out. I’ll write up a review once I begin to
think I’ve got a handle on it.
The things I can tell you so far: You want the microscope, and you
want to use ultra-high purity argon. (Grade 5) Check with your argon
supplier to see how much the high-grade argon will run. The
industrial argon I was using for my existing inert gas rig ran me
about $40/bottle. The list for the high-purity is $260/bottle.
(serious premium for the hi-test argon.) Remember to factor this in
to your run cost calculations. It ran on the industrial stuff, but
it’s much happier with hi-test. (I’m also doing a lot of titanium.
Titanium cares. Deeply.)
The improved cycle time on the 3+ is definitely a good thing. The 3+
cycles just about as fast as I can move my hand and retarget the tip.
I don’t find myself waiting for it to fire the way I suspect I would
with an older model. THe 3+ fires slightly faster than once per
second, while the older ones were more like once per 2-3 seconds, as
I understand it.
Beyond that, I’ve had it since mid January, and I haven’t really had
time to sit down and mind-meld with it yet. There will be more info
once I grok more fully.